diff options
| author | Jiri Slaby <jslaby@suse.cz> | 2012-11-15 09:49:54 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-15 17:20:58 -0800 |
| commit | de274bfe0fc81def6ddb8a17020a9a4b56477cc4 (patch) | |
| tree | fb2aeacdb9fc1e94b5aa13beb6a4818c043b43d3 | |
| parent | 9a8e62bc68832dc55a5e6868f812b65567fe66b5 (diff) | |
TTY: introduce tty_port_destroy
After commit "TTY: move tty buffers to tty_port", the tty buffers are
not freed in some drivers. This is because tty_port_destructor is not
called whenever a tty_port is freed. This was an assumption I counted
with but was unfortunately untrue.
Those using refcounting are safe now, but for those which do not we
introduce a function to be called right before the tty_port is freed
by the drivers.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/tty_port.c | 16 | ||||
| -rw-r--r-- | include/linux/tty.h | 1 |
2 files changed, 16 insertions, 1 deletions
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c index fdc42c2d565..b7ff59d3db8 100644 --- a/drivers/tty/tty_port.c +++ b/drivers/tty/tty_port.c @@ -122,12 +122,26 @@ void tty_port_free_xmit_buf(struct tty_port *port) } EXPORT_SYMBOL(tty_port_free_xmit_buf); +/** + * tty_port_destroy -- destroy inited port + * @port: tty port to be doestroyed + * + * When a port was initialized using tty_port_init, one has to destroy the + * port by this function. Either indirectly by using tty_port refcounting + * (tty_port_put) or directly if refcounting is not used. + */ +void tty_port_destroy(struct tty_port *port) +{ + tty_buffer_free_all(port); +} +EXPORT_SYMBOL(tty_port_destroy); + static void tty_port_destructor(struct kref *kref) { struct tty_port *port = container_of(kref, struct tty_port, kref); if (port->xmit_buf) free_page((unsigned long)port->xmit_buf); - tty_buffer_free_all(port); + tty_port_destroy(port); if (port->ops && port->ops->destruct) port->ops->destruct(port); else diff --git a/include/linux/tty.h b/include/linux/tty.h index d7ff88fb896..8db1b569c37 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -455,6 +455,7 @@ extern struct device *tty_port_register_device_attr(struct tty_port *port, const struct attribute_group **attr_grp); extern int tty_port_alloc_xmit_buf(struct tty_port *port); extern void tty_port_free_xmit_buf(struct tty_port *port); +extern void tty_port_destroy(struct tty_port *port); extern void tty_port_put(struct tty_port *port); static inline struct tty_port *tty_port_get(struct tty_port *port) |